"What if the battle you are facing isn't around you, but inside you?"
The real war happens in our minds.
We can train our minds to defeat our negativety by making a conscious choice each morning to be positive and happy. If we maintain this mindset throughout the day, when negative thoughts arise you can easily reject them and replace them with positive and happy thoughts.
Romans 12:2 kjv
"Be transformed by the renewing of your mind"
By chosing a positive mind set overcomes negativity.